Review on Preethi Circuit Breaker Switch Grinders by Dipp Samrock

I tried 3 of these. The first did not work at all up to 20 amps. The second worked at 11 amps after 30 seconds. The third worked at 11 amps after 20 seconds. After requesting a replacement for the first one, I was asked to return it, which I did. After requesting a replacement for the second one I was told NOT to return it so I didn't. However, I have been charged for 2 and have yet to find a way to contact Revain about these obviously inflated prices.